Wristwatch



FIG. 1 is a top and right-front perspective view of a wristwatch showing my new design;

FIG. 2 is a front elevational view thereof, the rear view being substantially a mirror image thereof but with the push-button omitted;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof; and

FIG. 5 is a top plan view thereof. 

The ornamental design for a wristwatch, as shown and described. 